Malicious PDF — malware analysis report

Static analysis result for SHA-256 711d53bb4b15a48f…

MALICIOUS

PDF

110.0 KB Created: 2021-08-14 10:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9b9d1def2e348b44767530c63c5dd377 SHA-1: f4c84dfbad7cdddf862f1a2b073ddcd428ccbefa SHA-256: 711d53bb4b15a48f2c132ba7c6e887cf4a4635c4cdee8fd71014ee7c03bb8ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/juifrgkkog24n7blb5dtk9lau9/zujaxemakapujatekogiwu.pdf In PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ac021fc66---xurapokola.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086de75afa55---gapakejapusi.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/jajikesugupisova.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e5bab3e537e52e326141b1efb0fc58d1/wutefubokegupizudemigifox.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kkktgl2ua5fddbs0535e7b1op6/77024354261.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/putuwuluzo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cd2969aeeae4e6342d577c2c0b2b88d1/mafujebululiworavoz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773a88432cf---tazoxifa.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/15078633126.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/75841106473.pdfIn PDF document text
    • http://princeverma.in/uploads/files/musuramor.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c732adb97ee---53125748779.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/77381775059.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rukewavufidero.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a001172ba79---bitumibewilepukazirav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc574f242c0---kowuxinanajabebato.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210613_182410.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/febokugikapo.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/pukonavikifikakilumora.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/pokefudixutexapabafapa.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/96008333073.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/84464466925.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1885d0122---lawabalexojuzumiroro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=secret+language+of+birthdays+september+28PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 18048 bytes
SHA-256: d4ba85d349c6fa427189b499395f4257386b94629a9c9dd8a09a7d8a91b0d78e
font_01_sfnt_off00015a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6B 17416 bytes
SHA-256: b6ea055e5006fa1ace9b14cc61cf34dd6d4da821c511b66c73d9792cbf243865
font_02_sfnt_off000174ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC4 11824 bytes
SHA-256: deaa4427c901b3151671250561a749532fa2c52cbd62fd4bb4e8dd9fa10f2e3d

Open this report in the interactive analyzer, or submit your own file for analysis.